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Merwin Park, IL Weather Forecast
Merwin Park, IL Weather Forecast Date: 923 AM CDT Fri Oct 09 2026
The area/counties/county of: Madison County Il, including the cities of: Alton, Edwardsville, Belleville, Cahokia, Saint Charles, and Saint Louis.or toggle through each period.
Rest of Today... Sunny. Highs in the upper 80s. South winds 5 to 10 mph.
Tonight... Clear in the evening, then becoming partly cloudy. Lows in the upper 50s. Southeast winds 5 to 10 mph.
Saturday... Mostly cloudy. Highs in the lower 80s. Southeast winds 5 to 10 mph.
Saturday Night... Mostly cloudy with a 20% chance of showers. Lows in the upper 50s. East winds 5 to 10 mph.
Sunday... Sunny. Highs in the lower 80s. Northwest winds around 5 mph.
Sunday Night... Mostly clear. Lows around 60. Highs in the lower 90s.
Columbus Day... Mostly clear. Lows around 60. Highs in the lower 90s.
Monday Night... Mostly clear. Lows in the upper 60s.
Tuesday... Sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20%.
Tuesday Night... Mostly clear in the evening, then partly cloudy with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20%.
Wednesday... Mostly sunny with a 50% chance of showers. Highs in the mid 80s.
Wednesday Night... Mostly cloudy in the evening, then becoming partly cloudy. A slight chance of thunderstorms in the evening. A chance of showers. Lows in the mid 60s. Chance of rain 50%.
POP = Probability of Precipitation
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